Is this 73 beta too low for 18 post iui???

Queencocobrown

I finally got a BFP but I am a nervous wreck over here! I received 2 iui's back to back on the 24th and 25th of June 2012. Today is the 13th and I received these numbers today from my RE and she said that it is good. However, I am reading the forums and seeing numbers way higher for the days post iui. Now, I am not to sure when I ovulated but I know that I had implantation bleeding on the 6th day after the last iui. So, are these numbers good?? I am soooooo nervous and worried. I just want this to work out for me. TY in advance guys